They are not highly pathogenic (harmful) to adult dogs, but large numbers can cause weight loss and a pot-bellied appearance to puppies and weak adults. Decreased appetite, vomiting or diarrhea will be observed on occasion. Puppies will sometimes die with serious roundworm infections.

What happens if roundworms go untreated in dogs?

If left untreated, worms can damage your dog's internal organs and lead to loss of consciousness and death. If you suspect that your dog has worms, take it to your nearest veterinary office. Most intestinal worms are easy to treat and your veterinarian will prescribe a medication based on the diagnosis.

Can roundworms kill a dog if not treated?

Therefore, it's vital that newborn puppies receive appropriate veterinary care. Roundworms are diagnosed by a fecal sample and are treated with deworming medications. If left untreated, roundworms can lead to poor growth and death in severe cases.